CVE-2026-105221
Gist RubyGem before 6.1.0 Disabled TLS Certificate Verification
- Published
- Oct 4, 2026
- Updated
- Oct 5, 2026
- Assigning CNA
- VulnCheck
- Evidence observed
- Oct 6, 2026
Primary CVSS
nvd · CVSS 4.0
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:XLow · next 30 days
- Percentile
- 6.7%
- Model date
- Oct 5, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
The gist RubyGem before 6.1.0 contains an improper certificate validation vulnerability that allows on-path attackers to intercept HTTPS traffic because http_connection in lib/gist.rb sets VERIFY_NONE. Attackers can present any certificate to read or modify GitHub API traffic, stealing OAuth tokens and login credentials to read and modify the victim's gists.
Sources
CVE-2026-105221 - gist RubyGem - High - MITM - GitHub OAuth token theft
Responsible use
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